Group 0: the noble gasesIB MYP Chemistry: Mind map

Exam questions on Group 0: the noble gases

1. A party shop in Dubai fills foil balloons with helium. The balloons float upwards when released, and the shop owner has been told that helium is much safer to use than hydrogen.
   Explain why helium is safer than hydrogen for filling balloons.2 marks
2. A welder in a workshop in Seoul joins two stainless steel plates using a very hot electric arc. A steady stream of argon gas is blown over the hot metal while the welding is done.
   Explain why argon is used instead of air during welding.2 marks
3. The boiling points of the first five noble gases are: helium −269 °C, neon −246 °C, argon −186 °C, krypton −153 °C and xenon −108 °C. A student is asked to predict the properties of radon, the next noble gas below xenon. Room temperature is 20 °C.
   Describe the trend in boiling point down the group.3 marks